Improvement in sand and gravel driers



S. S. DAISH.

SAND AND @RAVEL DRIER. N0.169,895, Patented Nv.1e,`1a75.

P .A P.

WHIne @Zw N. PETERS, PN(JTD.LITMOGRMHER` WASHINGTON, D. C.

UNITED STATES PATENT OFFICE.

SILAS S. DAISH, OF WASHINGTON, ADISIRIO'IV OF lCOLUMBIA.

,IMPROVEMENT |'N SAND AND GRAvEL DRIERs.

Specification forming part of Letters Patent No. [69,895, dated November 16, 1875; application iled October 14, 1875.

To all whom it may concern Be it known that I, S. S. DAIsH, oi' Washin gton, District of Columbia, have invented a Sand and Gravel Drier, of which the following is a speciiication:

The object of my invention is to rapidly dry sand and gravel; and it consists of two perforated cylinders, one inside of the other, the

inside cylinder to be perforated at an angle ofy about forty-'tive degrees, and inclosed witha conical top, as shown in drawing, the outside cylinder to be perforated at an angle of about forty degrees, as shown in draw'ings, both cylinders to be set perpendicularly.

The grate-bars will sit in the inside of O of drawings. I also have a blower, Vwhich forces the draft under the grate-bars, and the hot air will strike the conical top, and return and pass back down the sides and out of the perforations P into the sand or gravel, thus superheating and applying the hot air directly to t the material without letting the material into the re. The perforations in the outside cylinder will admit of the necessary evaporation.

cylinders, the furnace, and the blower.

2. The combination, in a sand or gravel drier, of the furnace I) audits combustionchamber, the inner perforated cylinder C, the

outer perforated cylinder A, and the sand and gravel chamber between the two latter, substantially as and for the purpose set forth.

' srLAs s. DAIsH.

Witnesses THEODORE MUNGEN, H. A. DANIELs. 

